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  1. JPNinPA

    RPM dips/engine stalls at idle (intermittent), 99 4.0

    You should only need to turn less than 1/8 turn Never look down on anyone unless you are helping them up - Jesse Jackson
  2. JPNinPA

    RPM dips/engine stalls at idle (intermittent), 99 4.0

    1. Disconnect the POSITIVE battery Terminal and touch it to ground for 30 seconds. Or try to start with positive disconnected. This is to discharge the PCM capacitors, which maintain the Adaptive Memory. 2. Reconnect the Battery Cable 3. Turn Ignition Switch to the "ON" position but DO NOT start...
  3. JPNinPA

    RPM dips/engine stalls at idle (intermittent), 99 4.0

    How does it know?? PCM uses the TPS to know how far the skinny pedal is depressed. It also uses O2 sensors to keep the gas ratio in-the zone. When you’re coasting down the highway it is likely 1500-1800rpm maybe less. When you apply the break the wheels slor. Then the trans stalls the engine...
  4. JPNinPA

    RPM dips/engine stalls at idle (intermittent), 99 4.0

    Did you reset your PCM after replacing parts? If you haven’t the system is tring to use old data to run. It will take app500 mi and 50 cold starts to relearn. Before thst it uses factory presets. When the TPS is not connected the vehicle will have issues at idle. Esp when slowing to a stop...
  5. JPNinPA

    Air Bag Light On

    Awesome. Never look down on anyone unless you are helping them up - Jesse Jackson
  6. JPNinPA

    Random Misfire, No Codes

    Usually vac leaks cause high idle. >750rpm. Bad leak near 2k rpm. Smaller 900-1000rpm Non OEM IAC,TPS, CpK and CpS even O2 will fail right out of the box. Never throw the Originals away until you prove it was bad. Never look down on anyone unless you are helping them up - Jesse Jackson
  7. JPNinPA

    RPM dips/engine stalls at idle (intermittent), 99 4.0

    IAC controls the idle. TPS controls skinny pedal / fuel ratio. If the TPS is not reading zero pedal this rev issue may happen. Or if the TPS had bad connection. With engine off, by hand open and close the TB butterfly valve 20-50 times. Blow off the TPS with air and unplug and replug it back...
  8. JPNinPA

    Air Bag Light On

    Was she in the jeep at the time the light came on? Hehehe Check fuses disconnect battery first then reseat fuses. Check connections back of the instrument pannel. Never look down on anyone unless you are helping them up - Jesse Jackson
  9. JPNinPA

    Fixing my EVAP leak with a smoke machine.

    Cool! Great reference post. Where did you port the smoke in? Pic? Never look down on anyone unless you are helping them up - Jesse Jackson
  10. JPNinPA

    00 Jeep Grand Cherokee Laredo no start after heater core R&R

    I was going to ask if the key clicked when turning. That happened to me and without warning. Never look down on anyone unless you are helping them up - Jesse Jackson
  11. JPNinPA

    00 Jeep Grand Cherokee Laredo no start after heater core R&R

    When you turn the key do you get power to things ign powered? Id check and clean all ground points. Could you explain i. More detail no start? You turn key and no power? No sound? Turns but dids noy run? Tried but will not catch ! Never look down on anyone unless you are helping them up -...
  12. JPNinPA

    Random Misfire, No Codes

    Plugs should be Champion 7034, Autolite APP985, Single platinum plugs or stock NGK Copper will wear quick due to the high energy ignition. You could run double platinum or iridium plugs just don’t expect them to be better. They may last longer. That’s it. Fuel pressure. Verify fuel...
  13. JPNinPA

    Is my AC clutch on the way out?

    Haven’t messed much with ac systems in a vehicle. Here is a good diagnostic link. Never look down on anyone unless you are helping them up - Jesse Jackson
  14. JPNinPA

    97 4.0 knock popped up out of no where.

    Sucks!!! Burnt valve? Exhaust leak sometimes sounds like a knock. Intake leak one cylinder lean. Gummed up rings/ blow by Never look down on anyone unless you are helping them up - Jesse Jackson
  15. JPNinPA

    New member

    Hello Rosa!! Welcome to the board. Post up pics of your jeep if you could Never look down on anyone unless you are helping them up - Jesse Jackson
  16. JPNinPA

    CJ7 No Heat after new heater core and blower

    Can you blow air through the hoses and heater core? If so maybe bleed the core by loosening the return line. Never look down on anyone unless you are helping them up - Jesse Jackson
  17. JPNinPA

    Time for another water pump

    Gates makes a good water pump. Just stay away from any yhat have a metal impeller. It failed fast and didn’t pump well. As far as the clutch? If it is not broken do not fix it. Never look down on anyone unless you are helping them up - Jesse Jackson
  18. JPNinPA

    Random Misfire, No Codes

    Fuel pressure should be 49 +/-5 psi What spark plug brand and part number. What are they gapped to? How do the plugs look? Pics please Never look down on anyone unless you are helping them up - Jesse Jackson
  19. JPNinPA

    Would an extractor work to change the fluid in my automatic transmission

    TP works Fresh TP Thats kinda brown. Some red showing. Run it a week and do another swap. Each dump and fill changes ~30% dump and fill app 6 times and you will have 80%-90% new fluid. Never look down on anyone unless you are helping them up - Jesse Jackson
  20. JPNinPA

    Would an extractor work to change the fluid in my automatic transmission

    Dot some on a white napkin, Paper. Not the silk ones you used last time. Looks dark but it could be the lighting or something. Never look down on anyone unless you are helping them up - Jesse Jackson
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